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In general, the opposite of trivial.

An integral which has neither limit infinite and from which the integrand does not approach infinity at any point in the range of integration.

A ruled semicircle used for measuring and drawing angles.

In this work, the name Pythagoras's constant will be given to the square root of 2, sqrt(2)=1.4142135623... (1) (OEIS A002193), which the Pythagoreans proved to be ...

Combine the two above squares on the left into the single large square on the right.

A plane figure for which quadrature is possible is said to be quadrable.

The number theta in the quadric (x^2)/(a^2+theta)+(y^2)/(b^2+theta)+(z^2)/(c^2+theta)=1 is called the parameter.

An m-ary n-ic polynomial (i.e., a homogeneous polynomial with constant coefficients of degree n in m independent variables).

Let B_t={B_t(omega)/omega in Omega}, t>=0, be one-dimensional Brownian motion. Integration with respect to B_t was defined by Itô (1951). A basic result of the theory is that ...

((a+b)/2)^2-((a-b)/2)^2=ab.